I had a blood transfusion in 1978, after the birth of my first child. I was a blood donor before becoming pregnant and once I was able to, I started donating again without any problems.
During the last few weeks of my second pregnancy, I was summoned to see my GP as a blood test revealed that I had anti Kell antibodies in my blood. I must admit, I hadn't a clue what it was but my GP did his best to explain it.
(Google it if you're interested.)
My husband had to get his blood tested to see if his was Kell positive. If it was, it was probably the reason why I had the antibodies.
Baby number 1 inherited his blood group and there was a transfer of baby's blood to mine. This could have caused serious complications to any future babies I might have.
It turned out that he had the same blood group as me, so the cause of my developing the antibodies must have been from the transfusion I had in 1978.
Two days later I went into labour 10 days early, still waiting for the results of my husband's blood test and me fearful of delivering a stillborn child.
All went well, thankfully, though baby number 2 had jaundice.
Once again, I returned to donating my blood when I could, but this time my donor card was stamped indicating that I had antibodies in my blood.
I remained a donor up until my 50s. I just assumed that the transfusion service tested my blood. Now I'm not so sure.